docs: def frog_to_saf(tokens):
      """
      Convert frog tokens into a new SAF document
      """
      tokens = [_add_pos1(token) for token in tokens]
      module = {'module': "frog",
                "started": datetime.datetime.now().isoformat()}
      return {"header": {'format': "SAF",
                         'format-version': "0.0",
                         'processed': [module]
                         }, "tokens": tokens}